Free Money
Type $@! to receive 10 million Pennies from Heaven. Works up to five times!!

Secret Bad Thing
Type SAMNMAX (must be in all caps) three times to receive the secret Bad Thing

Secret building
Change the view to north in Hell. Locate an unused corner and build a square road surrounding an empty 7x7 space. Change time mode to "Divine Intervention". Build the following pattern in that space, where B is Blue, BR is Brown, O is Orange, G is Green, P is Purple, Y is Yellow, and R is Red: